Sash lock



I. L. BANDY Jan. 17, 1956 SASH LOCK 2 Sheets-Sheet l Filed May 14, 1954 Jan. 17, 1956 l. L. BANDY 2,731,286

SASH LOCK Filed May 14, 1954 Y 2 Sheets-Sheet 2 55 INVENToR Z/ Isaac L. @anc/g United States PatentfOice l 2,731,286 Y Patented Jan. 17, 1956 l The present invention relates generally to improven ments in locks for slidable window sashes. i

The primary object of the present invention 1s the `provision of a more practical and reliable window sash lock that may be used on many types of sliding windows, either of double sash or single sash, with or without sash Weights and springs.

Another object of the present invention is to provide a double action sash lock in which it the lock. bolt were inadvertently left in unlocked condition, a latch member will act to limit movement of one of the windenl sashes to a specified distance.

A further object of the present invention is to provide a sash lock which permits the window sashes to be locked in a partially opened position, and which permits the use of a room air conditioning unit in a window frame with the window sashes locked over the unit top.

A still further object of the present invention is the provision of a sash loci; and latch that in the case of double hung windows, one portion or" the invention could be attached to the lower sash and the other to the upper sash, and in locked position both sashes could be moved to permit ventilation from the top and also the bottom of the window opening.

A still further object of the present invention is to provide a sash lock of inexpensive construction and one requiring only the use of a screw driver for its installa tion.

These and other objects and advantages of the present invention will be apparent upon consideration of the following description when taken in connection with the annexed drawings, in which:

Figure 1 is a front view in elevation or an embodiment of the present invention installed on the lower and upper sashes of a double hung window;

Figure 2 is a transverse vertical section taken on line 2-2 of Figure l;

Figure 3 is a horizontal section taken on line 3-3 of Figure l;

Figure 4 is a horizontal section taken on line 4-4 of Figure 5;

Figure 5 is a transverse vertical section taken on line S-S of Figure 4; and

Figure 6 is a vertical longitudinal section taken on line 6 6 of Figure 5.

Referring in detail to the drawing in which like reference numerals indicate like parts throughout the several views, the illustrated device comprises a box-like casing 1), the top wall of which has a slot 11 through which extends the reduced threaded shank of a thumbscrew 12. The casing 1li also has another opening 13 in its top wall through which extend the upstanding lugs 14 which hold a shaft 15' on which is swingably mounted the latch 16 which has its free end beveled as indicated at 17.

The thumbscrew 12 screws into bolt 18 which slides in the casing the one open end of the casing.

one end of the locking 10 and projects out of The legs 14 are formed as a part of the locking bolt 18. A spring 19 on the latch 16 is of the over-center type and acts to bias the latch downwardly in one position and holds the latch in an upwardly angulated position, the spring 19 being secured at one end to the latch 16 and at its other end to the top wall of the casing 10 at a point forwardly or outwardly of the shaft 14 in the extended or operative position of the bolt 18, as shown in Figure 2 of the drawings. The head of the screw 12 bears uponthe upper side of the top wall of the casing 1li.

In Figures 5 and 6 the casing 1G is seen to be secured by screws 21 and 21 to the upper edge of a lower window sash 22 and on the other sash 23 is secured the elongated locking strip 24 whichis formed with a pair of notches, one ol' which is formed with straight-sided walls 25 and the other with one straight-sided wall 26 and one sloping wall 27. The strip 24 is secured by screws 28 and receives in its notches the locking element 18 and the latch 16, the latter being engageable in the notch having the sloping wall 27, to restrain movement of the upper sash in one direction only.

A spring 29 is positioned in the casing 1l) at the other end from the locking bolt and is held by a pin 31 which is secured byone of its ends to the casing 1li and has its other end received in the hole 32 in the locking bolt 18. The casing 10 has a semi-circular front face 33 bearing against the tace of `the sash or sill.

The latch 16 may be manually swung out of engagement with the lock strip 24, to the retracted position indicated at 34 in the dotted lines of Figure 2, wherein it is held by the spring 19, and the locking bolt 18 may be secured either seated in one of the proper notches or out of engagement with any of them by tightening the thumbscrew 12, `with the locking bolt 18 in retracted position, although normally the spring 29 tends to press the locking bolt into engagement with one of the notches.

lt will be observed that with the bolt 18 in fully retracted position, shown in Figure 2, the latch 16 remains in engagement with the locking strip 24, and that the sashes 23 and 22 are not locked together for movement as a unit in a window frame. In the retracted position of the bolt 1S the upper sash 23 is free to be raised relative to the lower sash 22, since the latch 19 will ride over the locking strip 24 and its notches. However, once the upper sash 23 has been elevated relative to the lower sash 22 to an extent that any one of the strip notches is above the latch 16, the upper sash cannot thereafter be lowered beyond a point at which the latch 16 will engage in the nearest notch thereabove. As shown in Figure 2 of the drawings, with the locking bolt 18 engaged in a related strip notch, the latch 16 is simultaneously engaged with a related notch, so that relative movement of the sashes 22 and 23 is positively prevented, and extra resistance to downward relative movement of the upper sash 23 is provided, in the nature of a double lock.

While a single embodiment of the present invention has been here shown and described, it is contemplated that other embodiments may be made and practiced without departing from the spirit and scope of the invention as set forth in the appended claims.

What is claimed is:

l. In a sash lock for a pair of relatively slidable sashes, a locking strip secured vertically on one sash, said strip having notch means therealong, a casing fixed on the other sash in line with the locking strip, said casing having an open end facing the locking strip, an opposed closed end, and a top wall, a locking bolt slidably conned in said casing and siidably engaging said top wall, said bolt having first and second ends and being arranged to occupy a retracted position in the casing with said first end out ot" contact with the locking strip and an extended position through the open end of the casing with said rst end in contact with the locking strip, spring means acting between the closed end of the casing and said second end of the locking bolt and biasing the locking bolt into contact with the locking strip and into a notch thereof, the top wall of the casing having a longitudinal slot, and a thumbscrew having a shank threaded into said locking bolt at a point near said second end of the locking bolt, said thumbscrew having an enlarged head bearing upon the top wall of the casing, said thumbscrew being arranged to be tightened to hold the locking bolt in either a retracted or an extended position in engagement with said notch means, said notch means comprising succeeding pairs of notches, one of the notches of each pair having straight sided walls and the other of the notches of said pair having one straight sided wall and one sloping wall, a latch pivoted on said locking bolt, said latch having a free end, spring means biasing the free end of the'latch into constant engagement with the locking strlp even in the retracted position of the locking bolt, the free end of the latch being engageable in the other of the notches of each pair one at a time.

2. In a sash lock for a pair of relatively slidable sashes, a locking strip secured vertically on one sash, said strip having notch means therealong, a casing fixed on the other sash in line with the locking strip, said casing having an open end facing the locking strip, an opposed closed end, and a top wall, a locking bolt slidably confined in said casing and slidably engaging said top wall, said bolt having first and second ends and being arranged to occupy a retracted position in the casing with said first end out of contact with the locking strip and an extended position through the open end of the casing with said first end in contact with the locking strip, spring means acting between the closed end of the casing and said second end of the locking bolt and biasing the lockingbolt into contact with the locking strip and into a notch thereof, the top Wall of the casing having a longitudinal slot, and a thumbscrew having a shank threaded into said locking bolt at a point near said second end of the locking bolt, said thumbscrew having an enlarged head bearing upon the top Wall of the casing, said thumbscrew being arranged to be tightened to hold the locking bolt in either a retracted or an extended position in engagement with said notch means, said notch means comprising succeeding pairs of notches, one of the notches of each pair having straight sided walls and the other of the notches of said pair having one straight sided wall and one sloping Wall, a latch pivoted on said locking bolt, said latch having a free end, spring means biasing the free end of the latch into constant engagement with the locking strip even in the retracted position of the locking bolt, the free end of the latch being engageable in the other of the notches of each pair one at a time, with the locking bolt in either a retracted position or in an extended position and engaged in the one of the notches of each pair.

References Cited in the file of this patent UNITED STATES PATENTS 832,731 James Oct. 9, 1906 974,696 Narahara Nov. 1, 1910 1,141,286 Takacs June l, 1915 1,336,242 Larson Apr. 6, 1920 @sans 

